fixed read for len > 3, added clock stretching checks
fixed read for len > 3, added clock stretching checks

kubostech/KubOS,Psykar/kubos,Psykar/kubos,Psykar/kubos,Psykar/kubos,Psykar/kubos,kubostech/KubOS,Psykar/kubos,Psykar/kubos